Machine for attaching articles



Oct. 6, 1942.. M. MOCANN MACHINE FOR ATTACHING AfiTIcLns Filed May 25,1940 4- Sheets-Sheet 1 GUM/MAM Oc t. 6, 1942. M. McCANN 2,298,246 1MACHINE FOR ATTACHING ARTICLES File d May 25, 1940 4 Sheets-Sheet 2 Oct.6, 1942. M. Mcc N I 2,298,246

MACHINE FOR ATTACHING ARTICLES Filed may 25; 1940 4 Shets-Sheet s Oct.6,1942. M. MC NN 2,298,246

MACHINE FOR nmcame ARTICLES Filed May 25, 1940 4 Sheets-Sheet 4 E E g 2E E F E '5 6 5g D g 5 2 Q2 1.1.! g Egg 5+ E START 1 4 g c E5 IINIP$+CUT5 z. THD. END u 0 L I 0 5k 2 c E 6 m 2' 4 9 RELEASES F Y ZNIPPEDEND h CLO5ED 3 g I0 I 56' OPEN g g5 curs THD. L k 1 N|P5+CUT5 55fi.- THD.END 93 7 LL M m 8 :5 95 12 96' I3 1' i l4 g 15 v k E x 44 z w2% w L 44; m 1

O 5 START r fi g K l \n I? -"T' 1 T8 a 80 1 Q l J I9 RELEASES, l .g 4NIPPEDEND I/ I Q a 20 I? curs THD. START ['Iichael mean Wfne$$ Patented.Oct. 6, 1942 UNITED STATES PATENT OFFICE V V mcnnmron i'iffo nmcan'rrcms Michael McCann. Ozone Park, N. Y., asaignor to The SingerManufacturing Company, Elizabeth, N. 1., a corporation New JerseyApplication ma 25,

thread-end appearing on the under side of the g 13 Claims. Thisinvention relates to a machine for attaching articles to work'and moreparticularly to a machine for attaching articles to work by a pluralityof disconnected groups of stitches. A fourhole flat button is a goodexample of an article in which this form of attachment is desirable andtherefore, for convenience, this invention will be shown and describedas embodied in a flat-button sewing machine, but it is to be understoodthat the invention is not limited 'to'button-sewing machines and thatother embodiments and uses are contemplated.

- A primary object of this invention is to provide an improvedarticle-attaching machine adapted, in a single continuous operation, toattach articles to work by two parallel groups of stitches,

without any connecting or cross-over stitch be-- tween the'groups.Another, object of the invention is to provide, in an article-attachingmachine as above described, an improved automatically actuatedthread-clamping and -cutting mechanism which will nip the thread at thebeginning of each group of stitches'to facilitate the forming ofstitches; which will trim oi! the beginning end of the thread beneathand'close to the work; and which will sever the thread at the completionof each group of stitches. V

A further object of the invention is to provide, in combination with athread-cutter and -clamp,

. as above described, thread-controlling means, in

addition to the usual thread take-up adapted to pullback on the threadat the beginning of each I group of stitches so that the length ofthread-end required to be trimmed off will be reduced to a therebypreventing thread wastage, and which also wiil'glve up thread to thestitchforming elements as maybe required for the proper formation ofstitches.

a still further object is to provide threadclampingand thread-tensioningmeans actuated in timed relation with the thread-cutter, threadnipperand thread-controller so that at certain times during the cycle ofoperation thread may be drawn freely vfrom the supply while at othertimes the thread is clamped and drawing of thread from the supply isprecluded, all as is required for the proper functioning of thestitchforming and thread-cutting mechanisms. Still another object of theinvention is to provide an improved method of attaching. articles towork which will eliminate the usual cross-over stitch on the face of thearticle; which will securely anchorthe beginning end 'of the thread; and

which will reduce, to a minimum, the length of 1940, Serial No. 337,16l

work.

With the above and .other objects in view, as

will hereinafter appear, the invention comprises the devices,combinations, and arrangements of parts hereinafter set forth andillustrated in the accompanying drawings of a preferred embodiment ofthe invention, from which the several features of the'invention and. theadvantages'attained thereby will be readily understood by those skilledin the art.

In the drawings, Fig. 1 is a side elevation, partly insection and with aside cover-plate thereof described and showing alsoa portion of theneedie-bar vibrating mechanism.

Fig. 4' is a detail plan view of the actuating means for thethread-cutting and -nipping mechanism,

Fig. 5 is an enlarged vertical sectional view substantially along theline 5-5 of Fig. 4 showing more particularly the thread-cutting and-nlppi ng mechanism and a portion of the stitchforming mechanism.

Fig. 6 is a disassembled perspective view of the machine throat-plateand elements of the threadcutting and -nipping mechanism which cooperatetherewith. I 40 Figs. 7, 8, 9,10 and ll'arelongitudlnal verticalsections takensubstantially on the line 5-5 of Fig. 4 illustrating theaction ofthe thread-cutter and -nipper in conjunction with thestitch-forming mechanism.

Fig. 12 is a transverse vertical section substantially on the line I2I2of Fig. 4 showing the coaction oi the thread-cutter'and the looper inthe severing of the needle-thread.

Figs. 13, 14 and 15 are enlarged vertical sectional views through awork-piece and a button,

illustrating the manner in which the nipped beginning end of the threadis drawn up and covered by the button-attaching stitches.

Fig. 16 is a diagrammatic veiw illustrating the action oi thethread-tension, thread-clamp.

removed, of a button-sewing machine embodying thread-controller andthread-cutter and -nipper in conjunction with the reciprocations of theneedle.

Fig. 17 is a plan view of one product of the.

machine shown in Fig. l, to wit: a four-hole button attached to awork-piece by two disconnectd groups of stitches.

Referring more specifically to the drawings the invention is illustratedas embodied in a sewing machine comprising a base I, standard 2,overhanging arm 3 and a head 4 which carries a removable face-plate 4.Joumaled within the base I is a main shaft carrying loose and fastpulleys 6 and I, respectively, adapted to be driven by a power belt 8. Acombined stop-motion mechanism and belt-shifter, designated generally as9, is actuated by a conventional treadle mechanism, not shown, and isadapted to shift the belt from the loose pulley 6 to the fast pulley 1to start the operation of the machine. At the end of the operation thestop-motion is tripped automatically whereupon it shifts the belt to theloose pulley and brings the machine to rest with the parts in apredetermined position. Inasmuch as the stop-motion mechanism of thismachine forms no part of the present invention, detailed illustrationand description thereof is deemed unnecessary.

Rotatably journaled in bearings provided by the base I, and driven fromthe main shaft 5 by conventional mechanism common to the Singer Class1'75" button-sewing machines, is a looptaker-shaft I0, which carries, atits forward end,

a loop-taker, s'hown specifically as a rotary chainstitch looper II.Cooperating with the looper in the formation of stitches is aneye-pointed needle I2 secured in the lower end of a needle-bar I3mounted, for endwise reciprocation andv lateral vibration, in the head4, Adjacent its upper end.

the needle-bar is reciprocally mounted in a pivotblock I4 carried by astud I5 journaled in the machin head. The lower portion of the needlebaris reciprocally mounted in a block l6 carried by the forward end of avibratory lever I'I, fulcrumed on a stud I8 and carrying at its rearwardend a roller or stud I9 which tracks a needlebar vibrating cam-groove 20formed in the upper face of a rotary cam-disk 2I. The disk 2| is securedupon the upper end of a vertically disposed shaft 22 journaled in thestandard 2 and rotated from the main shaft 5 by a worm and wormwheelspeed-reduction gearing, designated generally as 23, having a ratio of20 to 1. Thus twenty rotations of the main shaft will produce onecomplete rotation of the cam-disk 2| and consequently one complete cycleof operation of the machine.

The needle-bar is reciprocated from a rockshaft 24 journaled in bearingsformed in bearingbrackets 25 and 2B provided'by the arm 3. At itsforward end the rock-shaft 24 carries an arm 21 which is connected by alink 28 to a collar 29 secured upon the needle-bar. Oscillatory motionsare given to the shaft 24 by an eccentric-30 secured upon the main-shaft5 and connected by a pitman 3| with a rock-arm 32 secured upon therearward end of the shaft 24. By reason of this construction theneedle-bar is given one reciprocation for each rotation of themain-shaft I and consequently twenty reciprocations in one completecycle of operation. For a more complete understanding of the needle-barreciprocating and vibrating mechanism, reference may be had to UnitedStates. patent to R. L. Plumley No. 1,671,124, May 29, 1928.

groove 0' which actuates an arm 0 secured upon the lower end of anupright shaft 0 journaled in the machine base and connected at its upperend to the clamp and work-plate. From the foregoing it will beunderstood that the needle is adapted to be reciprocated in two verticalpaths corresponding to the holes a and b of the button B in Fig. 17, andthat in each reciprocation the needle-thread loop is seized by thelooper II in the formation of chain-stitches. After the needle has beenreciprocated a suillcient number of times to produce the group ofstitches designated as d in Fig. 17, the work-plate P and buttonclamp,together with the work W and button B held thereby, are 'shifted endwisetoward the free end of the base I thereby causing'the reciprocatory andvibratory needle to enter the holes a and b in the buttom and togetherwith the looper to form a group of stitches e'. It will be noted thatthere is no connecting stitch between the groups of stitches d and e.The means for severing the needle-thread after the formation of thegroup d, so that no connecting stitch is formed, will hereinafter bedescribed.

As shown in Figs. 1, 2 and 3, the needlethread T passes from the supplythrough threadguides 33 and 34, between thread-tensions 35 and 36,thence through thread-eye 31, thread-clamp 38, thread-eyes 38' and 39,thence downwardly and around a roller 40 forming a part of athread-controller K. From the roller 40 the thread extends upwardly andaround a take-up roller 4I carried by the collar 28 secured to theneedle-bar. Next the thread extends downwardly and through alight-tension thread-guide 4| to a guide 42 secured upon the lower endof the needle-bar and thence through the eye I2 of the needle I2. Itwill readily be understood that as the needle-bar I3 and the roller 4Icarried thereby descend, the length of the bight of thread extendingfrom the roller 40 over the roller M and to the needle eye is shortenedand thus thread is given up to the looper. Conversely when theneedle-bar rises the bight of thread is lengthened and the thread ispulled back through the eye of the needle thereby setting the stitch.

The support for the thread-controller K, including the thread-guidingroller 40, comprises a lever 43 fulcrumed on a screw 44 threaded intothe arm of the machine. The rearward end of the lever 43 (see Fig. 1)carries a roller 45 later to be referred to. A coil-spring 46, havingits upper end connected to a pin 41 secured in the machine head 4' andits lower end connected to a similar pin 48 carried by the forward endof the lever 43, normally holds the forward end of the lever elevatedand in contact with the lower end of an adjustable stop 49 carried bythe faceplate 4 When the forward end of the lever 43 is in contact withthe stop 43, the roller 45, carried by the rear end thereof, ismaintained slightly above the upper flat face of the camdisk 2|.

Secured upon the upper face of the disk 2I This clamp and plate inposition to travel beneath the roller is are two cam-blocks (Fig.3),each having a first camsurface 5| (Fig. 1*) adapted to ride beneathandlift the roller 45, thereby-to give the thread-' controller K a firstdownward movement, in opposition to the spring 48, to draw thread backthrough the needle, and a second cam-surface 52 adapted to further liftthe roller 45, thereby to cause the thread-controller to be given afurther thread pull-back action. As the rear end The plunger 55 isnormally maintained depressed by a coil-spring 51 surrounding theplunger and interposed between the upperwall of the arm 3 .and a collar58 secured on the plunger. The lower end of the plunger 55 passesloosely through the bifurcated end of a lever 59 fulcrumed, at one (end,on a shoulder-screw 50 threaded into the bearing-bracket 25. A washer 6|surrounds the plunger 55 and rests upon the upper face of the lever 59.Interposed, between the washer BI and a collar 52 fixed upon the plungeris a coil-spring 83 which constitutes a yielding connection between thelever 59 and plunger 55. A bolt 54 having a rounded head. 65 isadjustably carried by the lever 59 intermediate its ends and is held inadjusted position- .plete formation of the first. stitch the threadtension 35 is maintained open and the tension 38 is temporarily openedsothat they do not impose any drag on the thread- The auxiliary meansfor temporarily releasing the tensions comprises -a rockshaft l8joumalled vertically in bearings H and 12 provided by the machinestandard. At

'its lower end the shaft-ll carries an arm 13 provided at its free endwith a roller 14 which tracks a cam-groove 15 formed in a cram-disk 16secured upon the shaft "beneath the camdisk'2l. Fixed upon the upper endof the shaft 18 (see Fig. 3) is a two-armed lever II, the free ends ofthe arms 18 and 19 of which are beveled and are adapted to enterbetween-the thread.- engaging disks of the thread-tensions and 35,respectively, thereby to spread the disks apart and relieve the tensionon the thread passing therethrough.

As hereinbefore stated the present machine is adapted to attach articlesto work by two dis- 1 connected groups-of stitches made during a singlecontinuous two-stage operation of the machine.

To accomplish this result; one group of stitches is madeand, while themachine continues to run, the thread is cut, the second group is madeand the thread is again out.

The thread-cutter comprises a combined thread-cutting and -nipping blade80 located by a clamp-nut 65. The head is adapted, at

predetermined times, to be engaged and lifted by the upper rounded headsof two studs 61 carried 'by the cam-disk 2i and spaced apart 180degrees. When either of the studs 61 passes beneath'the head 65' thelever 59 is lifted and the thread T is clamped between the plunger head55 and the overlying plate 54. As the studs pass from beneath the bolthead the plunger is again depressed by the spring '51 and the thread isreleased.

The thread-tension 35 hereinbefore referred to is of the intermittenttype and normally is adapted to apply a tension to the thread duringeach up-stroke of the needle-bar and take-up 4| carried thereby, to setthe stitch and to release the thread during the down-stroke of theneedle when it is pulling thread from the supply. The tension 35 isreleased periodically by a cam 68 secured upon the main-shaft 5.throughthe medium of a spring-depressed push-rod 59, as shown more fully in myprior United States Patent No. 1,983,555, Dec.;1-1, 1934. Thethreadtension 36 is of the constant type and applies a tension to thethread at all times except as hereinafter described.

During the formationof the first stitch of each beneath the throat-plateX and secured upon the-forward end of a cutter-actuating bar 8| mountedfor endwise sliding movement in the bed I. The rearward end ofthe bar 8!is pivotally connected, at 82, to one end of an extensible link 83, theother end of which is pivotally attached to one end of a lever 84fulcrumed at 85 on a plate 88 secured to the machine base. 'Intermediateits ends the lever 84 carries a roller 81 which tracks a cam-groove 88formed inthe upper face of a cam-disk 89 securedupon the shaft 22 abovethe cam-disk c. The cam-groove 88 is formed so as to give the bar 8!,and blade 88 carried thereby, backward and forward movements, as arerequired to give the thread-cutter and -nipper their proper actions, aslater will be arranged between the under side of the throatto bereferred to. After the first stitch has been made and the thread hasbeen anchored in. the

. work the tensions '35 and 36 may operate in 7 plate X and the upperface of a complemental thread-cutting blade90 provided with amaperture90. The blade 90 is secured to the throat.- plate byscrews 9fand isadapted to be placed under tension, so as to exert an upward pressure onthe blade 88, by a screw 92 passed loosely through the blade and thmadedinto the throatplate.

The thread-cutting and -nipping blade 88 is formed with a notch 93, thetransverse wall 94 of which is beveled so as to constituteja cuttingedge 94 and an aperture 95 having a short longitudinal wall 95 inclineddownwardly and termina-ting at its lower end in a cutting edge 96 Thecutting edge 94 is adapted to cooperate with a complemental cutting edge90 provided by the blade 98 to shear off the beginning end of thethread, as hereinafter will be described.

The cutting edge 96 of the blade 80 is adapted,

'at predetermined times, i. e., at the completion 'of of needle-threadagainst the cutting edge 98 and in Fig. 12.

The cutting and nipping blade 80 underlies throat-plate.

severs the thread, as indicated in dotted lines the throat-plate Xadjacent the needle-hole :1: therein, and, at predetermined times duringthe sewing cycle, nips the end of the thread between the upper surfaceof. the blade 80 and the lower surface of the throat-plate, as shown inFigs, 8, 9, 13 and 14, to facilitate theformation 01 stitches.

Operation The two-stage cycle of operation of the machine, when sewing afour-hole button by two of button-sewing machine. To simplify thedrawings, the work-clamp and work-supporting plate have been omittedfrom Figs. '7 to 15 and the work-piece is shown as resting directly onthe Next the operator trips the stopmotion to start the machine. Duringthe first down-stroke of the needle, the cam 88 shifts thethread-cuttting and -nipping plate 80 to the left from the positionindicated in dotted lines and marked Start, in Fig. 16, to the positiondesignated as e, so that the needle descends in the notch 93 to theright of the cutting edge 94 As the needle starts its firstup-stroke,.the looper'engages the thread-loop and pulls the threaddownwardly, as indicated in Fig. 7. At the end of the first up-stroke ofthe needle, the thread-cutting and -nipping blade 80 is moved to theright to the position designated as j, thereby cutting off the beginningend t of the thread and nipping the thread between the blade 80 and thethroatplate, as indicated in Fig. 8. As shown by Fig. 16;

during the first complete reciprocationof the needle, the tensions 36and 36 are closed, as indicated by the word "On; the thread-clamp '38 isclosed to prevent drawing of thread from the supply; and thethread-controller K is moved downwardly, from the Start position to theposition designated as 1 in Fig. 16, thereby drawing back on theneedle-thread and reducing the length of the free 'end of the threadbelow the throat-plate. With the blade 80 in the position indicated byj, the needle is aligned with the aperture 95 and the next eightreciprocations are made, respectively, in the positions indicated by thenumbers 24-4-5-5-1-8-9; the needle being vibrated laterally betweensuccessive stitches and forming the group of stitches designated as d inFig. 17.

During the second reciprocation of the needle, the tensions 35 and 36are open, as indicated by the word Off, in Fig. 16, and the thread-clamp38 is open, so that thread readily may be pulled from the supply, thethread-controller K is moved upwardly to the position designated as 2thereby to give up thread to the stitch-forming mechanism, and the blade80 remains stationary and continues to hold the beginning end of thethread nipped against the under side of the throatplate.

During the third reciprocation of the needle, the thread-tensions areclosed and remain closed controller remains stationary. Thethread-cutting and -nipping blade remains stationary through the secondto ninth reciprocations of the.

the position shown in Fig. 9 to the position shown in Fig. 10, likewisefrom the position I, in Fig.

16, to the position a to release the nipped end of the thread. Duringthe tenth reciprocation of the needle,, the cutting and nipping blade ismoved tothe left from the position a (Fig. 16) to the position It.During this movement the cutting edge 96 of the blade III-is broughtinto the path of movement of one limb oi the threadloop which is forcedthereagainst by the wing of the looper, and severed as hereinbeforedescribed. During the tenth reciprocation of the needle, the threadclamp is closed and the thread-controller K draws thread back from theneedle to tighten the thread and assist in the thread-cutting operation.

The above described partial operation of the machine completes theformation of the group of stitches d, shown in Fig. 17, and thereaftersevers the needle-thread thus completing the first stage of theoperation. The machine continues to operate and during the eleventhdown-stroke of the needle the button-clamp C and work-plate P are moved.endwise to the left thereby positioning the holes a and b of the buttonB in alignment with the needle. Continued operation of the machinerepeats the partial operation, hereinbefore 'described, therebysimilarly producing the group of stitches e and severing the thread atthe end of the stitching cycle, whereupon the stop-motion brings themachine to rest, at the completion of the second stage of operation,with the needle elevated, and the threadcutting and -nipping blade inthe position indicated by i, in Fig. 16. 4

In making the group of stitches d, the needle makes its ninth and tenthreciprocation in the same .hole in the button thereby producing aknotting or tying stitch. Likewise the group of stitches e is concludedby a knotting or tying stitch, the needle, for this purpose, making itsnineteenth and twentieth reciprocations in the same hole.

In the above description of the operation of the machine, the normal andconstant take-up action of the take-up 4| and the normal intermittentaction of the tension 35 have been disregarded inasmuch as those actionsare conventional and have no special significance with the presentinvention.

Having thus set forth the nature of the invention, what I claim hereinis:

1. In a sewing machine having a frame including a work-support and anoverhanging head, an endwise reciprocatory thread-carrying needlemounted in said head, and a rotary loop-taker located beneath saidwork-support and cooperating with said needle in the formation ofstitches; the improvement which consists in the provision of athread-cutter comprising a shiftable cutter-blade having athread-cutting edge arranged substantially parallel to the axis ofrotation of said loop-taker, and means for periodically shifting saidcutter-blade to position said thread-cutting edge in the path ofmovement of throughout the succeeding reciprocations includ- I one limbof the thread carried by the loop-taker whereupon further rotation ofthe loop-taker,

carries the thi'ead into contact with said threadcutting edgeand seversthe thread.

aaoaa-ie thread-clamp and the stitch-forming mechanism; means foroperating the machine through 2. In a sewing machine having an endwisereciprocatory thread-carrying needle and a rotary chain-stitch loopercooperating with said needle in the formation 01 stitches; theimprovement which consists in the provision of a thread-cuttercomprising a shiftable cutter-blade having a thread-cutting edgearranged transverse to the path of rotation of said looper, said bladehaving an operative position with its cutting edge within the path ofmovement of one limb of the thread-loop carried by said looper and aninoperative position with said cutting edge remote from said path, andmeans operative at a predetermined point in the cycle of operation ofthe machine for shifting said cutter-blade from its inoperative positioninto its operative position so that the looper will carry one limb ofthe needle thread loop into contact with said cutting-edge to sever thethread.

3. In a sewing machine having an endwise reciprocacy thread-carrying,needle and a looptaker cooperating with said needle in the formation ofstitches; the improvement which consists a predetermined articleattaching cycle, means for nipping the sewing thread, ineans forsevering the sewing thread, and means for actuating 7 each of saidtension-releasing means, thread.-

7. In a sewing machine having stitch-iorming mechanism, athread-tension, means for releasing said tension, a thread-clamp locatedintermediate the thread-tension and the stitchin the provision of athread-cutter comprising a shiftable cutter-blade having athread-cutting edge arranged transverse to the path of movement of saidloop-taker, said blade having an operative position withits cutting edgewithin the path of movement of one limb of the threadloop carried bysaid loop-taker and an inoperative position with said cutting edgeremote from said path, and means rendered effective at the end of thestitch forming cycle of the machine -for shifting said cutter-blade fromits inoperative position into its operative position 'so that theloop-taker will carry one limb of the needle-- thread 100p into contactwith said cutting-edge 'forming mechanism, means for operating the 7machine through a predetermined two-stage sewing cycle, a combinedthread-nipping and -severing blade for nipping the thread at thebeginning of each stage and for severing the sewing thread at the end ofeach stage, and means for actuating each of saidtension-releasing means,thread-clamp, and thread-nipping and -severing blade a plurality of 7times during said sewing cycle.

8. In a sewing machine having stitch-forming mechanism, athread-tension, means for releasing said tension, a thread-clamp locatedintermediate the thread-tension and the stitchforming mechanism, athread-controller located intermediate the thread-clamp and thestitchforming mechanism; means for operating the machine through apredetermined sewing cycle,

adapted to cooperate with the cutting edge of said stationary blade, andmeans for periodically shifting said shiitable blade to cause saidcooperating edges to trim'ofi the beginning end of the thread andthereafter to align the other cutting edge of said shiftable blade withone limb of a thread-loop carried by said loop-taker whereupon saidloop-taker carries said threadlimb into contact withsaid other cuttingedge cle holding means, stitch-forming mechanism, a thread-tension,means for releasing said tension,

a thread-clamp-located intermediate the threadthread-clamp,thread-controller andv means for nipping the sewing thread, means fortrimming oi the free end of the nipped thread, means for severing thesewing thread after the completion of a group of stitches, and means foractuating eachof said tension-releasing means, thread-clamp,thread-controller, thread-nipper, thread-trimmer and thread-severingmeans a plurality of times during a complete sewing cycle.

9, Athread-cuttihg mechanism for sewing machines having a rotary looperand a complemental'needle carrying a sewing thread, comprising a movablethread-cutting blade having a pluralityof thread-cutting'edges, astationary cutting blade adapted to cooperate with one of said cuttingedges, means to shift said movable blade to cause said cooperating edgesto cut off the beginning end of said sewing thread, and means operativeafter a predetermined number of stitches have been made to give to saidmovable blade another movement to cause the other cutting edge thereofto be broughtinto the path of movement of a limb of .a thread-loopcarried by said looper whereby the looper carries said limb against saidother cutting edge to sever said thread.

10. A thread-cutting mechanism for sewing stationary cutting bladeadapted to cooperate with one of said cutting edges, means to shift saidmovable blade to cause said cooperating edges to cut oil the beginningend of said sewing tension and the stitch-forming mechanism, a

thread-controller located intermediate the threadjand means operativeafter a predetermined number of stitches have been made to give to saidmovable blade another movement to cause the other cutting edge thereofto be brought into the path of movement of a limb ofa threadloop carriedby the wing of said looper whereby the looper wing carries saidlimbagainst said other cutting edge to sever the thread.

machines having a. loop-taker and a complemental needle carrying asewing thread, com-'- with one of said cutting edges, means to shift,

said movable blade in one direction to cause said cooperating edges tosever said sewing thread, and means to move said blade in the oppositedirection to cause the other cutting edge thereof to be broughtinto thepath of movement of a limb of a thread-loop carried by said loop-takerwhereby the loop-taker carries said limb against said other cutting edgeand severs the thread.

12. A thread-cutting and -nipping mechanism for sewing machines having athroat-plate, a rotary looper and a complemental needle carrying asewing thread, comprising a movable thread-cutting and -nipping-bladelocated beneath the throat-plate and having a thread-nipping portioncooperating with the underside of the throat-plate and a plurality ofthread-cutting edges, a stationary cutting blade adapted to cooperatewith one of said cutting edges, means to shift said movable blade tocause the thread to be nipped between the blade and the throatplate andto cause said cooperating edges to'trim oil the free end of the nippedthread, and means operable after a predetermined number of 11. Athread-cutting mechanism for sewing blade another movement to cause theother cutting edge thereof to be brought-into the path of movement of alimb of a thread-loop carried by said looper whereby the'looper carriessaid limb against said other cutting edge to sever the thread.

13. A thread-cutting mechanism .ior sewing machines having athroat-plate, a loop-taker and a complemental needle carrying a sewingthread, comprising a stationary cuttersblade adjacentto but spaced fromsaid throat-plate, a movable I thread-cutting and -nipping blade locatedbetween said stationary blade and said throat-.

mined number of stitches have been made to give 0 to said movable bladeanother movement to cause the other cutting edge thereof to be broughtinto the path of-movement of a limb of a thread-' loop carried by saidloop-taker whereby the looptaker carries said limb against said otheroutstitches have been made to give to said movable ting edge to severthe thread.

MICHAEL McCANN.

